[llvm] [AMDGPU] Add intrinsic readanylane (PR #115696)

[Jay Foad via llvm-commits]

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@@ -97,9 +98,11 @@ bool AMDGPUInstructionSelector::isVCC(Register Reg,
 
 bool AMDGPUInstructionSelector::constrainCopyLikeIntrin(MachineInstr &MI,
                                                         unsigned NewOpc) const {
+  const bool NeedExec = NewOpc != AMDGPU::SI_READANYLANE;
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jayfoad wrote:

Why doesn't readanylane need exec?

https://github.com/llvm/llvm-project/pull/115696